Logging in always sends you back to the main page (creating an account does too, IIRC), but the menu options at the top change to reflect your logged-in status. You might already know this; you don't mention if you've ever successfully logged in before.

I hadn't encountered this issue, either. Have you checked that your browser's privacy settings aren't too strict? For instance, if I turn on private browsing and also block ALL cookies & website data, I can't log in properly.

I emailed Switch and he's working on the issue. Apparently, there's a problem where if you try logging in with a wrong password or try to create a new account with similar fields to an old account, the process fails but doesn't tell you anything.